Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A circus legend leaves an unexpected endowment.

A community of collapsing homes more than a mile out from the Florida coast.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Jacksonville's highways rendered this century-old grammar school unusable.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

This historical swimming pool near Miami is emptied and refilled each day with naturally filtered water.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

The world's northernmost brewery uses water from a 2,000-year-old glacier to create its beer.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Where Venice's gondolas go for a tune-up.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Monasteries on rock pillars, once accessible only by frayed ropes.

Where commuters walk through remnants of an ancient Greek necropolis.

An underground city of salt.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.